Help me find this webnovel please
I read this novel a while back in a certain website, idk what happened but that novel got erased in my reading list. It was a typical regression story.
The mc was a nobody, a commoner, who is a son of a knight and a detective. His father worked as a low rank knight at a powerful clan family (IDK the name but let’s call it Clan A). Both of his parents died so he became an orphan at a young age. All throughout his childhood he has suffered and overcame a lot of illness including cancer. At 17, if I remember correctly, he got diagnosed by an incurable illness related to mana core.
The story goes like he asked for helped from clan A but he was betrayed. He was a loyal follower but now tried seeking for revenge only to face death. He regressed back to his teens when he was enrolling in an academy. He is good with swords. There he met two female characters. One was the daughter of another clan connected to clan A that had something to do with his mana core illness, who her brother is in prison for helping mc in the past and now viewed as an insane person by his clan. While the other fmc, is a genius in sword whose life goal is to track and kill a serial killer that killed her brother and lover. The mc knew the 2nd fmc for she was the one who taught him swordsmanship and also because he liked her in his previous life.
Some couple things to note that this novel had a prison arc where the mc visited the 1st fmc brother and another arc where mc is involve in a play while saving the 1st fmc. Another arc is where they are invited to clan a property where an event is held.
This is all I can remember. please help me find it